Hughes Christensen Drill Bit Catalog

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DIAMOND BIT OPTIONAL FEATURES * C1 – Carbide Supported Edge (CSE) The Carbide Supported Edge feature is a special configuration of the edge geometry that improves durability and modifies damaging stresses in a critical area of the cutter. C2 – Polished Cutter/Carbide Supported Edge Combination Cutter option where the Polished Cutters are combined with Carbide Supported Edge geometry. C3 – “Black Ice” Polished Cutters “Black” Ice cutters have highly polished surfaces, whose extremely low friction coefficient reduce shear forces, improving cuttings removal and drilling efficiency. D – Directional Option Bits with the Directional option incorporate a 30 degree back rake on all cutters (face and gauge). A PDC cutter with a higher backrake reduces the aggressiveness of the cutter. The “D” option can provide a smoother torque response and better control of the toolface angle in some steerable motor applications. EB – Extended B Profile This option describes an extended B profile on natural diamond bits that normally use an RB profile. The EB profile uses a smooth transition between the nose and the gauge creating a rounded shoulder instead of a straight flank. G1 – Undercut Gauge The G1 option is designed specifically for AR and AG Series bits. The gauge pads are set at 0.025” under the full hole diameter as defined by the PDC gauge trimmers. The G1 option is designed to provide better side cutting ability and therefore improve angle build capability and steerability. G2 – Shorter Gauge Than Standard The G2 gauge option is defined as any gauge length shorter than the standard for a given bit size. G3 – Step Gauge The G3 gauge option, also known as the step gauge, consists of two equal length gauge pad sections, a primary pad and a secondary pad. This feature is designed to provide the steerability and build rate benefits of the G2 option while minimizing the disadvantages of reduced durability and stabilization. G5 – In-Gauge PDC Trimmers Additional PDC cutters are flush mounted on the leading edge of the gauge pads. G8 – Longer Gauge Than Standard The G8 option is any gauge length that is longer than the standard gauge length for a given bit size. G9 – Turbine Sleeve For greater bit stability when drilling with high rotational speeds, an optional gauge sleeve may be added. J – Chipbreaker Feature The “J” option is a face volume/junk slot enhancement that is more commonly known as the chipbreaker feature. The chipbreaker assists bit cleaning by creating a sharp deflection of the cuttings after moving off the face of the cutter causing them to break off in discrete elements before forming long contiguous chips. K – Wear Knot Matrix pads located behind the PDCs restrict the depth of cut. Used almost exclusively in horizontal or high angle drilling, Wear Knots help minimize large torque variations that could cause the toolface angle to swing erratically. M – Multiport Hydraulics Due to room constraints, effectively adding nozzles to bits smaller than 8 3/4” can pose design problems. This option indicates fixed ports or a combination of fixed ports and nozzles have been designed into the bit. P – Block Segments This option describes parallel-piped segments (also called block segments, interrupted segments, or Porcupine) on impregnated bits. The “P” option improves cleaning of the segments by providing crossflow paths in the segment profile. U1 – Natural Diamond Updrill The Updrill feature drills the formation when the bit is rotated while tripping out of the hole. This reduces the risk of problems in tight holes, unstable formations or salt sections. X – Extra Cutters This option provides additional cutters on each blade in the shoulder area. Y – Box-Up Connection Some directional drilling applications utilizing turbines have required the smallest possible distance between the bit face and the lower bearing stabilizer. This has been achieved by using a pin-down connection on the turbine. *Features may only be available on certain styles. HUGHES CHRISTENSEN 30
TECHNICAL INFORMATION TFA Values Of Common Nozzle Sizes NUMBER OF NOZZLES Size 1 2 3 4 5 6 7 8 9 10 7 .0376 .0752 .1127 .1503 .1877 .2255 .2631 .3007 .3382 .3758 8 .0491 .0982 .1473 .1963 .2454 .2945 .3436 .3927 .4418 .4909 9 .0621 .1242 .1864 .2485 .3106 .3728 .4349 .4970 .5591 .6213 10 .0767 .1534 .2301 .3060 .3835 .4602 .5369 .6136 .6903 .7670 11 .0928 .1856 .2784 .3712 .4640 .5568 .6496 .7424 .8353 .9281 12 .1104 .2209 .3313 .4418 .5522 .6627 .7731 .8836 .9940 1.1045 13 .1296 .2592 .3889 .5185 .6481 .7777 .9073 1.0370 1.1666 1.2962 14 .1503 .3007 .4510 .6013 .7517 .9020 1.0523 1.2026 1.3530 1.5033 15 .1726 .3451 .5177 .6903 .8629 1.0356 1.2080 1.3806 1.5532 1.7258 16 .1963 .3927 .5890 .7854 .9817 1.1781 1.3744 1.5708 1.7671 1.9634 17 .2217 .4433 .6650 .8866 1.1083 1.3300 1.5516 1.7733 1.9949 2.2166 18 .2485 .4970 .7455 .9940 1.2425 1.4910 1.7395 1.9880 2.2365 2.4850 19 .2769 .5538 .8307 1.1076 1.3845 1.6614 1.9383 2.2152 2.4921 2.7690 20 .3068 .6136 .9204 1.2272 1.5340 1.8408 2.1476 2.4544 2.7612 3.0680 22 .3712 .7424 1.1137 1.4849 1.8561 2.2273 2.5985 2.9698 3.3410 3.7122 Diamond Drill Bit Recommended Make-up Torque API Reg. Recommended Bit Pin Conn. Make-up Torque Range O.D. inches kNm* 1000 ft-lbs inches 2.4 – 2.7 1.8 – 2.0 3 2 3 /8 3.3 – 3.7 2.4 – 2.7 3 1 /8 4.2 – 4.6 3.1 – 3.4 3 1 /4 2 7 /8 4.2 – 4.6 6.2 – 6.9 3.1 – 3.4 4.6 – 5.1 3 1 /2 3 3 /4 & larger API Diamond Bit Tolerances NOMINAL BIT SIZE O.D. O.D. TOLERANCE inches inches mm* up to 6 1 /4”, incl. +0. -0.015 +0. -0.38 6 25 /32” to 9”, incl. +0. -0.020 +0. -0.51 9 1 /32” to 13 1 /4” +0. -0.030 +0. -0.76 13 25 /32” and larger +0. -0.045 +0. -1.14 *Converted from inches 7.1 – 7.7 5.2 – 5.8 4 1 /8 3 1 /2 8.5 – 9.4 6.4 – 7.1 4 1 /4 10.4 – 11.4 7.7 – 8.6 4 1 /2 & larger 16.9 – 18.6 12.5 – 13.7 5 1 /2 4 1 /2 22.4 – 24.5 16.5 – 18.1 5 3 /4 23.9 – 26.3 17.6 – 19.4 6 & larger 6 5 /8 50.3 – 55.3 37.1 – 40.8 7 1 /2 51.5 – 56.7 38.0 – 41.8 7 3 /4 & larger 65.5 – 72.0 48.3 – 53.1 8 1 /2 7 5 /8 78.2 – 86.1 57.7 – 63.5 8 3 /4 81.3 – 89.5 60.0 – 66.0 9 & larger HUGHES CHRISTENSEN 31
Page 1 and 2: Hughes Christensen BAKER HUGHES Dri
Page 3 and 4: H ughes Christensen We are Hughes C
Page 5 and 6: while maintaining wellbore quality.
Page 7 and 8: HardRok Bits Designed For Hard And
Page 9 and 10: IADC BIT CLASSIFICATIONS S ERIES T
Page 11 and 12: ROCK BIT SIZES & TYPES Steel Tooth
Page 13 and 14: NOZZLE SELECTION Nozzles Standard M
Page 15 and 16: TRICONE BIT OPTIONAL FEATURES G Gau
Page 17 and 18: SEM Bearing Package UltraMax utiliz
Page 19 and 20: Clean Sweep Hydraulics Nozzles are
Page 21 and 22: Gauge Trimmers Patented, self-sharp
Page 23 and 24: Standard HardRok More Efficient Nos
Page 25 and 26: A TMGT/ATM Bits ATM bits are ideall
Page 27 and 28: A TJ Bits For applications requirin
Page 29: DIAMOND PRODUCT NOMENCLATURE ABD, B
Page 33 and 34: Application Specific Cutter Technol
Page 35 and 36: Application Specific Cutter Technol
Page 37 and 38: Carbide Supported Edge CSE cutters
Page 39 and 40: Unique Geometry Each Chipmaster is
Page 41 and 42: Black Ice Polished Cutters Black Ic
Page 43 and 44: S idetrack/Speedmill Sidetrack Bits
Page 45 and 46: RWD Designed specifically for rotar
Page 47 and 48: Germany Hughes Christensen Company

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